Vehicle testing system and vehicle testing methods

Abstract

This application provides a vehicle testing system and a vehicle testing method. The vehicle testing system includes a test bench, a test workpiece, a force loading device, a force sensor, and a torque detection device. The test workpiece includes a first test workpiece and a second test workpiece. The first test workpiece is mounted on the test bench and is used to assemble a fastener to be tested. The first test workpiece is identical to a first component, and the second test workpiece is identical to a second component. The force loading device is mounted on the test bench and is used to apply a load to the test workpiece. The force sensor is used to detect the clamping force of the fastener to be tested. The torque detection device is used to detect the torque of the fastener to be tested. This application uses actual vehicle workpieces to test fasteners, which can effectively verify the clamping force and torque of fasteners under actual stress conditions, both statically and after stress. This improves fastener process control and design verification, enhances vehicle stability and safety, and has a simple structure, saving costs.

Description

Technical Field

[0001] This application relates to the field of vehicle parts technology, and in particular to a vehicle testing system and a vehicle testing method. Background Technology

[0002] Vehicle fasteners are key components of a vehicle, bearing the various forces and torques exerted during vehicle movement.

[0003] However, if the fasteners are not designed and manufactured properly, they may become loose, vibrate, or even detach during use, potentially leading to serious safety incidents. Summary of the Invention

[0004] This application provides a vehicle testing system and a vehicle testing method, which can verify the design and process control of fasteners.

[0005] One aspect of this application provides a vehicle testing system, the vehicle including a first component, a second component, and a fastener, the fastener being used to connect the first component and the second component, the vehicle testing system being used to test the stress condition of the fastener to be tested, the vehicle testing system comprising:

[0006] Test bench;

[0007] The test workpiece includes a first test workpiece and a second test workpiece. The first test workpiece is disposed on the test bench. The first test workpiece and the second test workpiece are used to assemble the fastener to be tested. The first test workpiece is the same as the first component, and the second test workpiece is the same as the second component.

[0008] A force loading device, mounted on the test bench, is used to apply a load to the second test workpiece;

[0009] A force sensor is connected to the fastener under test and is used to detect the clamping force of the fastener under test under both unloaded and loaded conditions.

[0010] A torque detection device is used to detect the torque of the fastener under test under both unloaded and loaded conditions.

[0011] The vehicle testing system provided in this application uses actual vehicle workpieces to test the clamping force and torque of fasteners. It can effectively verify the clamping force and torque of fasteners under actual stress conditions, both statically and after stress, thereby improving fastener process control and design verification, enhancing vehicle stability and safety, and is simple in structure and cost-effective.

[0012] Furthermore, the first test workpiece includes a steering knuckle, which is fixed to the test bench;

[0013] The second test workpiece includes a swing arm, the steering knuckle and the swing arm being used to assemble the fastener to be tested, wherein the material of the swing arm includes at least one of steel and aluminum alloy.

[0014] Furthermore, the swing arm includes a first connecting portion and a second connecting portion opposite to each other. The first connecting portion is used to assemble the fastener to be tested, and the second connecting portion is used to connect with the force loading device, which is used to load the load onto the swing arm.

[0015] Furthermore, the load includes an axial load, the direction of which is the axial direction of the swing arm, and the axial direction of the swing arm is the line connecting the centers of the first connecting part and the second connecting part.

[0016] Furthermore, the force loading device includes a connector and a hydraulic loading device connected to the connector. The connector is used to connect the second test workpiece and the hydraulic loading device, and the hydraulic loading device is used to apply the load to the second test workpiece.

[0017] Furthermore, the fastener to be tested is assembled onto the test workpiece according to the corresponding assembly process requirements, wherein the assembly process requirements include at least one of the following: assembly method requirements, assembly torque, and clamping length.

[0018] Furthermore, the load is determined by vehicle operating conditions, which include at least one of road conditions, vehicle speed, vehicle type, vehicle age, ambient temperature, and ambient humidity.

[0019] Another aspect of this application provides a vehicle testing method, the vehicle including a first component, a second component, and a fastener, the fastener being used to connect the first component and the second component, the vehicle testing method being used to test the stress condition of the fastener to be tested, the vehicle testing method comprising:

[0020] The fastener to be tested is assembled between a first test workpiece and a second test workpiece, wherein the first test workpiece is located on a test bench, the first test workpiece is the same as the first component, the second test workpiece is the same as the second component, and the test bench is also provided with a force loading device.

[0021] The clamping force and torque of the fastener under test are detected under both unloaded and loaded conditions. The load is applied to the second test workpiece by the force loading device, the clamping force is detected by a force sensor connected to the fastener under test, and the torque is detected by a torque detection device.

[0022] Further, detecting the clamping force and torque of the fastener under test under both unloaded and loaded conditions includes:

[0023] When the fastener to be tested is not loaded with a load, the static clamping force of the fastener to be tested is detected, wherein the static clamping force is the clamping force of the fastener to be tested when it is not loaded with a load.

[0024] After the fastener to be tested has been left to stand for a preset time, the clamping force of the fastener under test and the final torque corresponding to the clamping force are detected.

[0025] Connect the force loading device and the second test workpiece;

[0026] A load is applied to the second test workpiece, and the ultimate clamping force of the fastener under test and the residual torque corresponding to the ultimate clamping force are detected.

[0027] Furthermore, before detecting the static clamping force of the fastener under test and the final torque corresponding to the static clamping force after the fastener under test has been left to stand for a preset time, the method further includes:

[0028] After the fastener under test has been left to stand for a preset decay time, the decay clamping force of the fastener under test is detected, wherein the preset decay time is less than the preset standing time.

[0029] Further, after applying a load to the second test workpiece and detecting the ultimate clamping force of the fastener under test and the residual torque corresponding to the ultimate clamping force, the method further includes:

[0030] The torque decay rate of the fastener under test is determined based on the final torque and the residual torque.

[0031] Based on the torque attenuation rate and design requirements, the fasteners to be tested are screened to obtain target fasteners that meet the design requirements.

[0032] Furthermore, before screening the fasteners to be tested based on the torque attenuation rate and the design requirements to obtain target fasteners that meet the design requirements, the process further includes:

[0033] Obtain the vehicle's operating condition and the type of the fastener to be tested;

[0034] The design requirements are determined based on the vehicle's operating conditions and the type of fastener to be tested.

[0035] Further, assembling the fastener to be tested between the first test workpiece and the second test workpiece includes:

[0036] Obtain the type of the fastener to be tested;

[0037] Based on the type of fastener to be tested, the corresponding assembly process requirements are determined, wherein the assembly process requirements include at least one of the following: assembly method requirements, assembly torque, and clamping length.

[0038] According to the assembly process requirements, the fastener to be tested is assembled between the first test workpiece and the second test workpiece.

[0039] Furthermore, assembling the fastener to be tested between the first test workpiece and the second test workpiece further includes:

[0040] Connect the force sensor to the fastener to be tested.

[0041] Furthermore, the first test workpiece includes a steering knuckle, which is fixed to the test bench; the second test workpiece includes a swing arm, which includes a first connecting portion and a second connecting portion opposite to each other.

[0042] The step of assembling the fastener to be tested between the first test workpiece and the second test workpiece according to the assembly process requirements includes:

[0043] According to the assembly process requirements, the fastener to be tested is assembled between the steering knuckle and the first connecting part of the swing arm.

[0044] Furthermore, the force loading device includes a connector and a hydraulic loading device connected to the connector;

[0045] Assembling the fastener to be tested between the first test workpiece and the second test workpiece includes:

[0046] Connect the connector to the second test workpiece, thereby connecting the hydraulic loading device to the second test workpiece.

[0047] Furthermore, before detecting the clamping force and torque of the fastener under test under both unloaded and loaded conditions, the method further includes:

[0048] The vehicle operating conditions are obtained, wherein the vehicle operating conditions include at least one of road conditions, vehicle speed, vehicle type, vehicle age, ambient temperature, and ambient humidity.

[0049] The load is determined based on the vehicle's operating conditions. Attached Figure Description

[0050] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0051] Figure 1 The diagram shown is a structural schematic of an embodiment of the vehicle testing system of this application;

[0052] Figure 2 The diagram shown is a flowchart of an embodiment of the vehicle testing method of this application.

[0053] Figure 3 As shown Figure 2 A flowchart illustrating an embodiment of step S100 of the vehicle testing method shown;

[0054] Figure 4 As shown Figure 2 The flowchart of step S200 of the vehicle testing method shown is a schematic diagram of an embodiment. Detailed Implementation

[0055] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0056] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates at least two. Unless otherwise indicated, the terms "front," "rear," "lower," and / or "upper," etc., are for ease of description only and are not limited to a location or spatial orientation. The terms "comprising" or "including," etc., mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected," "linked," etc., are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect.

[0057] The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0058] The vehicle testing system provided in this application includes a test bench, a test workpiece, a force loading device, a force sensor, and a torque detection device. The test workpiece includes a first test workpiece and a second test workpiece. The first test workpiece is mounted on the test bench and is used to assemble a fastener to be tested. The first test workpiece is identical to a first component, and the second test workpiece is identical to a second component. The force loading device is mounted on the test bench and is used to apply a load to the second test workpiece. The force sensor is connected to the fastener to be tested and is used to detect the clamping force of the fastener under test, both when no load is applied and when a load is applied. The torque detection device is used to detect the torque of the fastener under test, both when no load is applied and when a load is applied.

[0059] The vehicle testing system provided in this application uses actual vehicle workpieces to test the clamping force and torque of fasteners. It can effectively verify the clamping force and torque of fasteners under actual stress conditions, both statically and after stress, thereby improving fastener process control and design verification, enhancing vehicle stability and safety, and is simple in structure and cost-effective.

[0060] The vehicle testing method provided in this application includes: assembling a fastener to be tested between a first test workpiece and a second test workpiece, wherein the first test workpiece is disposed on a test bench, the first test workpiece is identical to a first component, the second test workpiece is identical to a second component, and the test bench is also equipped with a force loading device. The clamping force and torque of the fastener to be tested are detected under both unloaded and loaded conditions, wherein a load is applied to the second test workpiece by the force loading device, the clamping force is detected by a force sensor connected to the fastener to be tested, and the torque is detected by a torque detection device.

[0061] The vehicle testing system and vehicle testing method of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementation methods can be combined with each other.

[0062] Figure 1 The diagram shows a structural schematic of an embodiment of the vehicle testing system 10 of this application. The vehicle may include a sedan, SUV, off-road vehicle, or other power-driven, non-rail-borne vehicle; the power source of the vehicle may be fuel or a power battery, which is not limited herein. Specifically, the vehicle includes a first component, a second component, and fasteners. The fasteners are used to connect the first component and the second component. The vehicle testing system 10 is used to test the force condition of the fastener 500 to be tested. The vehicle testing system 10 includes a test bench 100, a test workpiece 200, a force loading device 300, a force sensor 400, and a torque detection device. The test workpiece 200 includes a first test workpiece 210 and a second test workpiece 220. The first test workpiece 210 is disposed on the test bench 100. The first test workpiece 210 and the second test workpiece 220 are used to assemble the fastener 500 to be tested. The first test workpiece 210 is identical to the first component, and the second test workpiece 220 is identical to the second component. The force loading device 300 is disposed on the test bench 100 and is used to apply a load to the test workpiece. A force sensor 400 is connected to the fastener 500 under test and is used to detect the clamping force of the fastener 500 under test, both when the fastener 500 is unloaded and under load. A torque detection device is used to detect the torque of the fastener 500 under test, both when the fastener 500 is unloaded and under load.

[0063] Clamping force represents the tensile force acting on the shank of a fastener during tightening, while torque represents the torque applied to the head of a nut or bolt during tightening. Clamping force and torque indicate the fastening characteristics of a fastener. When a fastener is subjected to force, it may loosen or even cause vehicle parts to detach. The vehicle testing system 10 provided in this application uses actual vehicle workpieces to test the clamping force and torque of fasteners. This effectively verifies the clamping force and torque of fasteners under actual stress conditions, both statically and after stress, thereby improving fastener process control and design verification, enhancing vehicle stability and safety, and offering a simple structure and cost-effectiveness.

[0064] It should be noted that the fastener to be tested 500 refers to the vehicle fastener object that needs to be tested, and the fastener to be tested 500 includes at least two different fasteners. The type of fastener to be tested 500 can include bolts, pins, rivets, and other fasteners applicable to vehicles. The aforementioned different fasteners can represent different types of fasteners; they can also include fasteners of the same type but different structures, such as embossed bolts and flange bolts; they can also include bolts of the same type but different specific structural parameters, such as first embossed bolts and second embossed bolts with different clamping lengths or different pitches. The material of the fastener to be tested 500 can include metal or plastic, and this application does not impose any limitations.

[0065] Optionally, the torque detection device may include a torque wrench, a torque sensor, or other torque detection equipment. The torque wrench may include a torque gun. The torque sensor can be connected to the fastener 500 under test for real-time torque detection. The force sensor 400 can be connected to the fastener 500 under test before it is assembled to the first test workpiece 210 and the second test workpiece 220. This allows for simultaneous collection of the clamping force of the fastener 500 during assembly, facilitating subsequent data processing and generating a real-time load monitoring graph. The torque detection device and the force sensor 400 can improve the accuracy of the detection.

[0066] In some embodiments, the test bench 100 includes a fixing part 110 and a worktable 120. The fixing part 110 is fixed to the worktable 120, and the first test workpiece 210 is fixedly connected to the worktable 120 through the fixing part 110. The fixed connection method may include bolt connection; it may also include other connection methods such as welding and riveting to improve the stability of the connection between the first test workpiece 210 and the test bench 100 and prevent the first test workpiece 210 from falling off due to force during the test.

[0067] In some embodiments, the force loading device 300 includes a connector 310 and a hydraulic loading device 320 connected to the connector 310. The connector 310 is used to connect the second test workpiece 220 and the hydraulic loading device 320, and the hydraulic loading device 320 is used to apply a load to the second test workpiece 220. Figure 1 As shown, optionally, the connector 310 may include a fork, and the second test workpiece 220 may be connected to the fork via bolts. The hydraulic loading device 320 can ensure the stability of the load loading.

[0068] It is understood that both the first and second components are vehicle parts, including but not limited to steering knuckles and control arms, body and dashboard, wheel bearings and wheels, and other components requiring fastener connections. Accordingly, in some embodiments, the first test piece 210 includes a steering knuckle fixed to the test bench 100; the second test piece 220 includes a control arm, and the steering knuckle and control arm are used to assemble the fastener 500 to be tested. In other embodiments, the first test piece 210 includes the body, and the second test piece 220 includes the dashboard; the first test piece 210 includes a wheel bearing, and the second test piece 220 includes a wheel. Based on the embodiment where the first test piece 210 includes a steering knuckle and the second test piece 220 includes a control arm, the material of the control arm can include at least one of steel and aluminum alloy, allowing the tester to effectively verify the clamping force and torque of the fastener under test conditions with both steel and aluminum alloy control arms. Figure 1 As shown, in some embodiments, the swing arm includes a first connecting portion 221 and a second connecting portion 222, the first connecting portion 221 being used to assemble the fastener 500 to be tested, and the second connecting portion 222 being used to connect with a force loading device 300, the force loading device 300 being used to load a load onto the swing arm.

[0069] In some embodiments, the fastener 500 to be tested is assembled onto the test workpiece according to corresponding assembly process requirements, wherein the assembly process requirements include at least one of assembly method requirements, assembly torque, and clamping length. The assembly process requirements differ for different types and structures of fasteners, and can be determined according to existing standards or specifications; this application does not impose any limitations on this.

[0070] In some embodiments, the load is determined by vehicle operating conditions. These conditions include at least one of road surface conditions, vehicle speed, vehicle type, vehicle age, ambient temperature, and ambient humidity. Road surface conditions include road smoothness, road wear, and other road condition parameters. It is understood that lower road smoothness, higher road wear, and worse road conditions result in greater damage to vehicle components such as the suspension system and wheels. Higher vehicle speeds and older vehicles experience greater damage to vehicle components during operation. Different vehicle types have different limits on the forces and torques that their fasteners can and must withstand. Extreme ambient temperatures and humidity levels, such as high temperatures and heavy rain, affect the tightness of fasteners.

[0071] Based on the above embodiments, vehicle operating conditions include vehicle driving conditions and vehicle extreme operating conditions. Vehicle driving conditions refer to the normal driving state of the vehicle, such as moderate road surface smoothness and wear, and the vehicle speed within the speed range stipulated by traffic regulations. Vehicle extreme operating conditions refer to the vehicle state under extreme conditions, such as poor road surface smoothness and high vehicle speed. In this case, the vehicle's fasteners will be subjected to greater external forces, which may lead to loosening, vibration, or even component detachment. The vehicle testing system 10 of this application embodiment, by considering vehicle operating conditions under a combination of various factors, especially extreme vehicle operating conditions, can effectively verify and check the rational design and process control of fasteners. The load determined by the vehicle testing system 10 of this application embodiment through vehicle operating conditions includes the load magnitude and the direction of the load force. The load may include axial load. In some embodiments, the direction of the axial load is the axial direction of the swing arm, and the axis of the swing arm is the center line connecting the first connecting part 221 and the second connecting part 222, to detect the axial clamping force of the fastener 500 under test. Figure 1 As shown, Figure 1 The "F" in the text indicates axial load. Figure 1 The arrow in the figure indicates the direction of the axial load F.

[0072] Figure 2 The diagram shown is a flowchart of an embodiment of the vehicle testing method of this application. The vehicle testing method of this application includes steps S100 to S200:

[0073] In step S100, the fastener to be tested is assembled between the first test workpiece and the second test workpiece. The first test workpiece is located on the test bench and is the same as the first component. The second test workpiece is the same as the second component. The test bench is also equipped with a force loading device.

[0074] In step S200, the clamping force and torque of the fastener under test are detected under both unloaded and loaded conditions. The load is applied to the second test workpiece by a force loading device, the clamping force is detected by a force sensor connected to the fastener under test, and the torque is detected by a torque detection device.

[0075] Figure 3 As shown Figure 2 The diagram illustrates a flowchart of one embodiment of step S100 of the vehicle testing method shown. In some embodiments, step S100 of the vehicle testing method of this application may include steps S110 to S130:

[0076] In step S110, the type of fastener to be tested is obtained.

[0077] In step S120, the corresponding assembly process requirements are determined according to the type of fastener to be tested. The assembly process requirements include at least one of the following: assembly method requirements, assembly torque, and clamping length.

[0078] In step S130, the fastener to be tested is assembled between the first test workpiece and the second test workpiece according to the assembly process requirements.

[0079] The assembly process requires specialized equipment operated by professional testers to tighten the fasteners to be tested.

[0080] In some embodiments, step S100 of the vehicle testing method of this application may further include step S140:

[0081] In step S140, the force sensor and the fastener to be tested are connected.

[0082] It should be noted that step S140 can be performed before any of steps S110, S120, and S130, ensuring that the force sensor is connected to the fastener under test before it is assembled into the first and second test workpieces. If the force sensor is connected to the fastener under test after it has been assembled into the first and second test workpieces, the clamping force will decrease over time, making it impossible to synchronously collect the clamping force of the fastener under test during tightening.

[0083] In some embodiments, the first test piece includes a steering knuckle fixed to a test bench, and the second test piece includes a control arm, the control arm including opposing first and second connecting portions. Step S130 of the vehicle testing method of this application may include step S131:

[0084] In step S131, the fastener to be tested is assembled between the first connection part of the steering knuckle and the swing arm according to the assembly process requirements.

[0085] Figure 4 As shown Figure 2 The illustrated flowchart shows an embodiment of step S200 of the vehicle testing method. Figure 4 As shown, in some embodiments, step S200 of the vehicle testing method of this application may include steps S210 to S240:

[0086] In step S210, the static clamping force of the fastener under test is detected when no load is applied, wherein the static clamping force is the clamping force of the fastener under test when no load is applied.

[0087] In step S220, after the fastener to be tested has been left to stand for a preset time, the clamping force of the fastener to be tested and the final torque of the corresponding clamping force are detected.

[0088] In step S230, the force loading device and the second test workpiece are connected.

[0089] In step S240, a load is applied to the second test workpiece, and the ultimate clamping force of the fastener to be tested and the residual torque of the corresponding ultimate clamping force are detected.

[0090] During the test, the ultimate clamping force can be collected when the clamping force reaches its maximum. The residual torque can then be collected when the ultimate clamping force is reached. After collecting the static clamping force of the fastener under test, the force loading device is connected to the second test workpiece; this ensures the accuracy of the static clamping force detection.

[0091] In this embodiment, the settling time may include 12 hours. A longer settling time can more accurately reflect the clamping force and final torque of the fastener after settling and decay.

[0092] In some embodiments, after step S240 of the vehicle testing method of this application, steps S250 to S260 may also be included:

[0093] In step S250, the torque decay rate of the fastener to be tested is determined based on the final torque and the residual torque.

[0094] In step S260, the fasteners to be tested are screened according to the torque attenuation rate and design requirements to obtain target fasteners that meet the design requirements.

[0095] Testers can compare the calculated torque attenuation rate with the design requirements for the vehicle's operating conditions and select the appropriate fastener from those being tested. Design requirements can include a range of specifications. If the torque attenuation rate falls within the specified range, the fastener being tested is deemed to meet the design requirements.

[0096] In some embodiments, step S270 may be included before step S220 of the vehicle testing method of this application:

[0097] In step S270, after the fastener to be tested has been left to stand for a preset decay time, the decay clamping force of the fastener to be tested is detected, wherein the preset decay time is less than the preset standing time.

[0098] In this embodiment, the preset decay time is 3 minutes. The decay clamping force can determine the degree of decay of the tightness of the fastener after it has been tightened within a short period of time.

[0099] In some embodiments, steps S280 to S290 may be included before step S260 of the vehicle testing method of this application:

[0100] In step S280, the vehicle operating condition and the type of fastener to be tested are obtained.

[0101] In step S290, design requirements are determined based on the vehicle's operating conditions and the type of fastener to be tested.

[0102] Vehicle operating conditions can include vehicle driving conditions and extreme vehicle operating conditions, which will not be elaborated further.

[0103] In some embodiments, the force loading device includes a connector and a hydraulic loading device connected to the connector. Step S100 of the vehicle testing method of this application may further include step S150:

[0104] In step S150, the connector and the second test workpiece are connected, thereby connecting the hydraulic loading device and the second test workpiece.

[0105] In some embodiments, the vehicle testing method of this application may further include steps S300 to S400 before step S200:

[0106] In step S300, vehicle operating conditions are obtained, including at least one of road conditions, vehicle speed, vehicle type, vehicle age, ambient temperature, and ambient humidity.

[0107] In step S400, the load is determined based on the vehicle's operating conditions.

[0108] The load parameters determined based on the vehicle's operating conditions include the load magnitude and the direction of force application. In some embodiments, the load includes an axial load, such as... Figure 1 As shown.

[0109] The table below shows the test results of clamping force tests on different fasteners using a vehicle testing system and method according to an embodiment of this application:

[0110]

[0111] It should be noted that the first and second embossed bolts are of the same bolt type, but their specific structural parameters differ. The corresponding assembly process requires an assembly torque of 90 Nm and a rotation angle of 120°. The test condition with a load of 20 kN represents typical vehicle driving conditions; the test condition with a load of 30 kN represents extreme vehicle operating conditions. By simulating extreme vehicle operating conditions, design problems caused by incomplete design verification can be avoided to some extent.

[0112] The table below shows the test results of torque testing on different fasteners using a vehicle testing system and method according to an embodiment of this application, and the torque attenuation rate is calculated based on the final torque and residual torque:

[0113]

[0114] Based on the test results and calculated torque attenuation rate in the table above, it can be seen that bolts of the same type and structure have different torque attenuation rates when the swing arm type is different. Therefore, designers and testers can comprehensively judge whether the clamping force and torque attenuation rate of different fasteners meet the design requirements during the production and assembly of parts based on the attenuation of different fasteners.

[0115] For the method embodiments, since they basically correspond to the apparatus embodiments, the relevant parts can be referred to in the description of the apparatus embodiments. The method embodiments and apparatus embodiments complement each other.

[0116] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A vehicle testing system, characterized in that, The vehicle includes a first component, a second component, and fasteners. The fasteners are used to connect the first component and the second component. The vehicle testing system is used to test the stress condition of the fasteners to be tested. The vehicle testing system includes: Test bench; The test workpiece includes a first test workpiece and a second test workpiece. The first test workpiece is disposed on the test bench. The first test workpiece and the second test workpiece are used to assemble the fastener to be tested. The first test workpiece is the same as the first component, and the second test workpiece is the same as the second component. A force loading device, disposed on the test bench, is used to apply a load to the second test workpiece; A force sensor is connected to the fastener under test and is used to detect the clamping force of the fastener under test under both unloaded and loaded conditions. A torque detection device is used to detect the torque of the fastener under test under both unloaded and loaded conditions. The static clamping force of the fastener under test and the final torque corresponding to the static clamping force are detected. The ultimate clamping force of the fastener under test and the residual torque corresponding to the ultimate clamping force are detected. The torque decay rate of the fastener under test is determined based on the final torque and the residual torque. Based on the torque attenuation rate and design requirements, the fasteners to be tested are screened to obtain target fasteners that meet the design requirements.

2. The vehicle testing system according to claim 1, characterized in that, The first test workpiece includes a steering knuckle, which is fixed to the test bench; The second test workpiece includes a swing arm, the steering knuckle and the swing arm being used to assemble the fastener to be tested, wherein the material of the swing arm includes at least one of steel and aluminum alloy.

3. The vehicle testing system according to claim 2, characterized in that, The swing arm includes a first connecting part and a second connecting part, the first connecting part is used to assemble the fastener to be tested, and the second connecting part is used to connect with the force loading device, the force loading device is used to load the load onto the swing arm.

4. The vehicle testing system according to claim 3, characterized in that, The load includes an axial load, the direction of which is the axial direction of the swing arm, and the axial direction of the swing arm is the line connecting the centers of the first connecting part and the second connecting part.

5. The vehicle testing system according to claim 1, characterized in that, The force loading device includes a connector and a hydraulic loading device connected to the connector. The connector is used to connect the second test workpiece and the hydraulic loading device, and the hydraulic loading device is used to apply the load to the second test workpiece.

6. The vehicle testing system according to claim 1, characterized in that, The fastener to be tested is assembled onto the test workpiece according to the corresponding assembly process requirements, wherein the assembly process requirements include at least one of the following: assembly method requirements, assembly torque, and clamping length.

7. The vehicle testing system according to claim 1, characterized in that, The load is determined by vehicle operating conditions, which include at least one of road conditions, vehicle speed, vehicle type, vehicle age, ambient temperature, and ambient humidity.

8. A vehicle testing method, characterized in that, The vehicle includes a first component, a second component, and a fastener. The fastener is used to connect the first component and the second component. The vehicle testing method is used to test the stress condition of the fastener to be tested. The vehicle testing method includes: The fastener to be tested is assembled between a first test workpiece and a second test workpiece, wherein the first test workpiece is located on a test bench, the first test workpiece is the same as the first component, the second test workpiece is the same as the second component, and the test bench is also provided with a force loading device. The clamping force and torque of the fastener under test are detected under both unloaded and loaded conditions. The load is applied to the second test workpiece by the force loading device, the clamping force is detected by a force sensor connected to the fastener under test, and the torque is detected by a torque detection device. The static clamping force of the fastener under test and the final torque corresponding to the static clamping force are detected. The ultimate clamping force of the fastener under test and the residual torque corresponding to the ultimate clamping force are detected. The torque decay rate of the fastener under test is determined based on the final torque and the residual torque. Based on the torque attenuation rate and design requirements, the fasteners to be tested are screened to obtain target fasteners that meet the design requirements.

9. The vehicle testing method according to claim 8, characterized in that, The step of detecting the clamping force and torque of the fastener under test under both unloaded and loaded conditions includes: When the fastener to be tested is not loaded with a load, the static clamping force of the fastener to be tested is detected, wherein the static clamping force is the clamping force of the fastener to be tested when it is not loaded with a load. After the fastener to be tested has been left to stand for a preset time, the clamping force of the fastener under test and the final torque corresponding to the clamping force are detected. Connect the force loading device and the second test workpiece; A load is applied to the second test workpiece, and the ultimate clamping force of the fastener under test and the residual torque corresponding to the ultimate clamping force are detected.

10. The vehicle testing method according to claim 9, characterized in that, Before detecting the static clamping force of the fastener under test and the final torque corresponding to the static clamping force after the fastener under test has been statically placed for a preset static time, the method further includes: After the fastener under test has been left to stand for a preset decay time, the decay clamping force of the fastener under test is detected, wherein the preset decay time is less than the preset standing time.

11. The vehicle testing method according to claim 8, characterized in that, Before screening the fasteners to be tested according to the torque attenuation rate and the design requirements to obtain target fasteners that meet the design requirements, the method further includes: Obtain the vehicle's operating condition and the type of the fastener to be tested; The design requirements are determined based on the vehicle's operating conditions and the type of fastener to be tested.

12. The vehicle testing method according to claim 8, characterized in that, Assembling the fastener to be tested between the first test workpiece and the second test workpiece includes: Obtain the type of the fastener to be tested; Based on the type of fastener to be tested, the corresponding assembly process requirements are determined, wherein the assembly process requirements include at least one of the following: assembly method requirements, assembly torque, and clamping length. According to the assembly process requirements, the fastener to be tested is assembled between the first test workpiece and the second test workpiece.

13. The vehicle testing method according to claim 12, characterized in that, The step of assembling the fastener to be tested between the first test workpiece and the second test workpiece further includes: Connect the force sensor to the fastener to be tested.

14. The vehicle testing method according to claim 12, characterized in that, The first test workpiece includes a steering knuckle, which is fixed to the test bench; the second test workpiece includes a swing arm, which includes a first connecting part and a second connecting part that are opposite to each other. The step of assembling the fastener to be tested between the first test workpiece and the second test workpiece according to the assembly process requirements includes: According to the assembly process requirements, the fastener to be tested is assembled between the steering knuckle and the first connecting part of the swing arm.

15. The vehicle testing method according to claim 8, characterized in that, The force loading device includes a connector and a hydraulic loading device connected to the connector; Assembling the fastener to be tested between the first test workpiece and the second test workpiece includes: Connect the connector to the second test workpiece, thereby connecting the hydraulic loading device to the second test workpiece.

16. The vehicle testing method according to claim 8, characterized in that, Before detecting the clamping force and torque of the fastener under test under both unloaded and loaded conditions, the method further includes: The vehicle operating conditions are obtained, wherein the vehicle operating conditions include at least one of road conditions, vehicle speed, vehicle type, vehicle age, ambient temperature, and ambient humidity. The load is determined based on the vehicle's operating conditions.

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